Floor cleaning roller core



FIG. 1 is a perspective view of a floor cleaning roller core showing our new design, with the roller tube cut away to show our core design;

FIG. 2 is an enlarged perspective view of the core in FIG. 1 (with the roller tube removed);

FIG. 3 is a front view thereof;

FIG. 4 is a cross-sectional view taken along line 4-4 in FIG. 3;

FIG. 5 is a cross-sectional view taken along line 5-5 in FIG. 3;

FIG. 6 is an enlarged right end view thereof; and,

FIG. 7 is an enlarged left end view thereof.

The broken lines illustrate environmental features that form no part of the claimed design. 

CLAIM The ornamental design for a floor cleaning roller core, as shown and described. 